package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.ObjectUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @program: hmdp
 * @ClassName LoginInterceptor
 * @description:
 * @author: oldTea
 * @create: 2024-04-28 21:26
 * @Version 1.0
 **/

/**
 * 为了防止有些情况token得不到刷新，因此新建拦截器拦截所有请求并刷新token
 */

public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    //java.lang.NullPointerException: null,因为拦截器是在bean实例化之前执行的，所以无法进行注入
//    @Autowired
//     StringRedisTemplate stringRedisTemplate;
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取token
        String token = request.getHeader("authorization");
        String key = RedisConstants.LOGIN_USER_KEY + token;
        //获取user
        Map<Object, Object> entries = stringRedisTemplate.opsForHash().entries(key);

        if(ObjectUtil.isEmpty(entries)){
            return true;
        }
        //将map对象转为userDto对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(entries, new UserDTO(), false);

        if(userDTO == null){
            response.setStatus(401);
            return false;
        }
        //刷新过期时间
        stringRedisTemplate.expire(key,30, TimeUnit.MINUTES);

        //保存用户信息到ThreadLocal中
        UserHolder.saveUser(userDTO);

        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}